Abstract
Experiments simulating interplanting of resistant rootstocks with susceptible rootstocks that maintain high population densities of Tylenchulus semipenetrans in field soil were carried out in microplots at two locations, and in an naturally infested orchard. Selections of Cleopatra mandarin (03) × Poncirus trifoliata (01) 03.01.5 and 03.01.13, Citrus volkameriana (23) × P. trifoliata 23.01.17, Troyer citrange (02) × Cleopatra mandarin 02.03.24, Troyer citrange × Common mandarin (04) 02.04.18, King mandarin (05) × P. trifoliata 05.01.7, and Carrizo citrange were exposed to continuous high population densities of a population of the Mediterranean biotype of T. semipenetrans. The selection 23.01.17 retained its resistance in the microplots and in the field (< 1.2% females and eggs per gram fibrous root of those on Carrizo citrange). The selection 03.01.5 also retained its resistance in the microplots at Moncada (< 0.5% females and eggs per gram fibrous root of those on Carrizo citrange) but numbers of females and eggs per gram fibrous root were 27% and 22% at Amposta, and 139% and 18% in the orchard of those on Carrizo citrange, respectively. The selection 05.01.7 supported equal number of females and 43% eggs per gram fibrous root of those on Carrizo citrange in the nematode-infested orchard. The remaining selections supported high populations of T. semipenetrans.
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Verdejo-Lucas, S., Galeano, M., Sorribas, F. et al. Effect on Resistance to Tylenchulus semipenetrans of Hybrid Citrus Rootstocks Subjected to Continuous Exposure to High Population Densities of the Nematode. European Journal of Plant Pathology 109, 427–433 (2003). https://doi.org/10.1023/A:1024220417737
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DOI: https://doi.org/10.1023/A:1024220417737